Help identifying Attitude ramp door bolt

fj12ryder wrote:
You need a Torx barrel nut, and bolt. The washer may be a separate part, mine was. You can find them at someplace like Fastenal or Graingers.

This seems to me to be your best solution, I don't know off hand what the thread sizes are for Tork screws so while there are a lot of substitutes for your nut, it's hard to say which supplier to send you to. There are a wide variety of T nuts and hex bolts but you would need to search further to find one that is acceptable.